By precisely controlling the airflow generated by the fan, it can form and maintain air curtains of different shapes according to different working environments, so as to achieve physical isolation of gases in different types of spaces;the entrances and exits of the production environment placed in different temperature zones can greatly reduce the exchange of cold and heat, and achieve the purpose of high efficiency and energy saving; at the same time, placing the entrances and exits of the production environment with high hygiene level requirements can also effectively prevent the entry of flying insects and dust.